Minerals are solid, naturally occurring, inorganic substances.
Typically consist of compounds made from multiple elements.
Important for various applications, including human diet.
Distinction between metals and minerals: Metals are often found mixed with minerals, but not classified as minerals themselves.
Common Examples of Minerals
Talc: Used in baby powder (talcum powder).
Gypsum: Found in drywall and sheetrock; a very soft mineral.
Calcite: Often found in limestone and marble.
Fluorite: Limited known applications.
Quartz: Used in various applications.
Topaz and Diamonds: Examples of precious stones.
Mining for Minerals
Minerals are finite resources and are exhaustible.
Complexity of mining methods to extract minerals:
Subsurface Mining: Involves digging underground in shafts; environmental consequences include sinkholes and exposure to noxious gases.
Surface Mining: Various techniques include:
Mountaintop Removal: Typically used for coal, but can also be used for certain minerals.
Strip Mining: Removal of strips of land; differences with pit mining that digs deeper.
Pit Mining: Digs deeper until reaching the water table, requiring pumping out water.
Environmental Impacts of Mining
Tailings: Leftover material post-extraction, raising concerns for waste management and pollution.
Habitat Loss: Resulting from surface mining techniques leading to ecosystem devastation.
Water Contamination: Tailings often end up in local streams, affecting water quality and aquatic life.
Acid Drainage: Exposure of acidic compounds during mining can result in toxic runoff into local waterways.
Health Risks: Potential exposure to toxins and health risks for miners, including diseases like black lung.
Historical Context - Hydraulic Mining
Hydraulic Mining: A historical method where soil was washed away using high-pressure water; banned in California in 1884 due to severe environmental damage, including stream pollution.
Evidence still visible today in California landscapes due to long-term ecological effects.
Rare Earth Elements
Rare earth elements are scarce and highly valuable for technology (electronics, magnets, batteries).
California mines for rare earth elements have reopened due to market demand after previously relying on imports.